From: Marc MERLIN <marc@merlins.org>
To: Qu Wenruo <quwenruo@cn.fujitsu.com>
Cc: Hugo Mills <hugo@carfax.org.uk>, linux-btrfs@vger.kernel.org
Subject: Re: btrfs support for filesystems >8TB on 32bit architectures
Date: Sun, 6 Nov 2016 21:36:47 -0800 [thread overview]
Message-ID: <20161107053647.uj7df3ppve4pbfms@merlins.org> (raw)
In-Reply-To: <0b840fbb-1a3d-d395-47ad-015e84eac05a@cn.fujitsu.com>
(sorry for the bad subject line from the mdadm list on the previous mail)
On Mon, Nov 07, 2016 at 12:18:10PM +0800, Qu Wenruo wrote:
> I'm totally wrong here.
>
> DirectIO needs the 'buf' parameter of read()/pread() to be 512 bytes
> aligned.
>
> While we are using a lot of stack memory() and normal malloc()/calloc()
> allocated memory, which are seldom aligned to 512 bytes.
>
> So to *workaround* the problem in btrfs-progs, we may need to change any
> pread() caller to use aligned memory allocation.
>
> I really don't think David will accept such huge change for a workdaround...
Thanks for looking into it.
So basically should we just document that btrfs filesystems past 8TB in
size are not supported on 32bit architectures?
(as in you can mount them and use them I believe, but you cannot create,
or repair them)
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ | PGP 1024R/763BE901
next prev parent reply other threads:[~2016-11-07 5:36 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-30 18:34 btrfs check --repair: ERROR: cannot read chunk root Marc MERLIN
2016-10-31 1:02 ` Qu Wenruo
2016-10-31 2:06 ` Marc MERLIN
2016-10-31 4:21 ` Marc MERLIN
2016-10-31 5:27 ` Qu Wenruo
2016-10-31 5:47 ` Marc MERLIN
2016-10-31 6:04 ` Qu Wenruo
2016-10-31 6:25 ` Marc MERLIN
2016-10-31 6:32 ` Qu Wenruo
2016-10-31 6:37 ` Marc MERLIN
2016-10-31 7:04 ` Qu Wenruo
2016-10-31 8:44 ` Hugo Mills
2016-10-31 15:04 ` Marc MERLIN
2016-11-01 3:48 ` Marc MERLIN
2016-11-01 4:13 ` Qu Wenruo
2016-11-01 4:21 ` Marc MERLIN
2016-11-04 8:01 ` Marc MERLIN
2016-11-04 9:00 ` Roman Mamedov
2016-11-04 17:59 ` Marc MERLIN
2016-11-07 1:11 ` Qu Wenruo
[not found] ` <87lgwwnnyf.fsf@notabene.neil.brown.name>
2016-11-07 1:20 ` clearing blocks wrongfully marked as bad if --update=no-bbl can't be used? Marc MERLIN
2016-11-07 1:39 ` Qu Wenruo
2016-11-07 4:18 ` Qu Wenruo
2016-11-07 5:36 ` Marc MERLIN [this message]
2016-11-07 6:16 ` btrfs support for filesystems >8TB on 32bit architectures Qu Wenruo
2016-11-07 14:55 ` Marc MERLIN
2016-11-08 0:35 ` Qu Wenruo
2016-11-08 0:39 ` Marc MERLIN
2016-11-08 0:43 ` Qu Wenruo
2016-11-08 1:06 ` Marc MERLIN
2016-11-08 1:17 ` Qu Wenruo
2016-11-08 15:24 ` Marc MERLIN
2016-11-09 1:50 ` Qu Wenruo
2016-11-09 2:05 ` Marc MERLIN
2016-11-11 3:48 ` Marc MERLIN
2016-11-11 3:55 ` Qu Wenruo
2016-11-12 3:17 ` when btrfs scrub reports errors and btrfs check --repair does not Marc MERLIN
2016-11-13 15:06 ` Marc MERLIN
2016-11-13 15:13 ` Roman Mamedov
2016-11-13 15:52 ` Marc MERLIN
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